kotlin-native是否具有析构函数?

问题描述

在kotlin本机中，有memScoped函数可以在控件超出范围时自动释放分配的内存.是否有类似本地对象的析构函数?

In kotlin native there is memScoped function that automatically free allocated memory when control is going out of scope.Is there something like destructors for local objects?

推荐答案

当内存中不再需要某些对象(Java语言中的finalizer)时，当前的Kotlin/Native不提供用于调用方法的机制，但是内联lambda可以轻松实现实现机制，类似于C ++中的RAII.例如，如果您想确定某些资源始终在离开特定范围后被释放，则可以执行以下操作:

Current Kotlin/Native does not provide mechanism for calling a method when certain object is no longer needed in memory (finalizer in Java speech) but inline lambdas easily allow to implement mechanisms, similar to RAII in C++. For example, if you want to be sure, that some resource is always released after leaving certain scope, you may do:

class Resource {
  fun take() = println("took")
  fun free() = println("freed")
}

inline fun withResource(resource: Resource, body: () -> Unit) =
 try {
   resource.take()
   body()
 } finally {
   resource.free()
 }

fun main(args: Array<String>) {
   withResource(Resource()) { 
       println("body") 
   }
}

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